Metal & Non-metal Oxides Flashcards
metal + oxygen →
metal oxide
4Li + O₂ → 2Li₂O , what is the color of the flame?
red
metaloxide + water →
metal hydroxide
If UI was added to LiOH, what color would it turn?
purple (strong base)
2Mg + O₂ → 2MgO , what color is the flame?
white
what color and state are group 2 compounds?
white (s)
Mg(OH)₂ is a WHITE SUSPENSION, if UI was added, what color would it turn?
blue (weak base) because fewer hydroxide ions dissolved
2Ca + O₂ → 2CaO , what color is the flame?
brick-red
CaO + H₂O → Ca(OH)₂ , what color does it turn with UI?
blue
4Al + 3O₂ → 2Al₂O₃ , what color is the flame?
orange
Al₂O₃ + H₂O doesn’t react, this means Al₂O₃ is…
amphoteric
define amphoteric
A substance that can act either as an acid or a base
What color is Fe₂O₃?
orange/brown (s)
Even though Fe₂O₃ is a base, why would the UI show a pH 7?
because indicators can only measure pH for (aq) solutions
Is ZnO amphoteric?
yes
Why do non-metals react with oxygen?
to form covalent oxides
What structure is most common for non-metal oxides?
discrete
What are the properties of non-metal oxides?
- low mpt
- soluble in oil-like substances
- do not conduct
non-metal oxide + water →
acid
4P + 5O₂ → 2P₂O₅
what color is the flame and what happens?
white flame, spontaneously combusts
P₂O₅ + 3H₂O → 2H₃PO₄
this is…
exothermic
what pH is carbonic acid?
pH5, yellow, weak acid
Is SiO₂ amphoteric?
yes
Name H₂SO₃
sulfurous acid
Name H₂SO₄
sulfuric acid
Air is consisting of…
78% Nitrogen
21% Oxygen
0.03% Carbon Dioxide
0.97% Argon
What color and state of matter are sulfur dioxide and sulfur trioxide?
colorless gas
